Air-float and bio-filter combined water treatment process

A combination of biofilter and technology, applied in the direction of sustainable biological treatment, flotation water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problems of dissolved oxygen waste, energy saving and consumption reduction, etc., to improve Water quality, improvement of water purification effect, effect of increasing load

Inactive Publication Date: 2008-12-10
BEIJING UNIV OF TECH
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Problems solved by technology

However, due to the effect of air flotation and aeration, the dissolved oxygen in the air flotation water can reach saturation or supersaturation (DO>8mg / L). If these dissolved oxygen cannot be effectively used, it will cause a waste of dissolved oxygen, which does not meet the Requirements for Energy Saving and Consumption Reduction in Sustainable Development

Method used

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  • Air-float and bio-filter combined water treatment process

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Embodiment

[0043] The treated urban sewage water quality is as follows: COD=220~500mg / L, BOD 5 =120~220mg / L, SS≤200mg / L, NH 4 + -N=55~85mg / L, NO 2 - -N3 - - N<1.5 mg / L, TP=3.5-8.0 mg / L, pH=7.0-8.0.

[0044] The treated effluent quality is as follows: COD5 4 + -N<5mg / L, the removal rate is over 95%; TN≤15mg / L, the removal rate is over 90%; TP≤0.5mg / L, the removal rate is over 90%; PH=7.0~8.0.

[0045] The specific treatment is as follows:

[0046] 1) Pretreatment: introduce urban sewage into the grid, grit chamber and sedimentation tank, mainly remove larger solid suspended solids in the sewage, and the effluent enters the flocculation tank;

[0047] 2) Flocculation: add about 20mg / L polyaluminum chloride into the flocculation tank to carry out flocculation reaction, in which phosphorus nutrient salt reacts with polyaluminum chloride to form phosphate precipitate;

[0048] 3) Air flotation: The pretreated and flocculated urban sewage enters the air flotation tank, and the surface ...

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Abstract

The invention discloses a water treatment process by combining an air floatation tank with a biofilter and relates to a water treatment process. The aim of the invention is to organically combine the air floatation with the biofilter to reach the comprehensive improvement of the water quality of the treated water. The process provided by the invention comprises the following steps that: (1) sewage water after pretreatment is introduced into an air flotation tank, and is subject to dephosphorization by the air flotation; simultaneously, a part of suspended substances are removed; (2) the sewage water is sent to the biofilter and subject to biological denitrification, and organisms and suspended substances of the sewage water are further removed; and (3) finally, effluent water is subject to disinfection treatment, wherein, the biofilter adopts a common biofilter, a high-load biofilter, a tower-type biofilter or an aerated biofilter. The process is suitable for a water body containing various organic pollutants, has low total energy consumption of aeration and high purification efficiency and can reach the first grade A emission standard and the aim of recycling.

Description

technical field [0001] The invention relates to a water treatment process, in particular to a treatment method suitable for various water bodies containing organic pollutants. Background technique [0002] Air flotation water purification refers to trying to introduce or generate a large number of fine air bubbles in the water to make them adhere to the impurity flocs, resulting in a state of density lower than that of water, and rely on buoyancy to make them float to the water surface, thereby achieving solid-liquid separation. Since the density of air is much smaller than that of water, only 1 / 775 of that of water, the flocs with a certain number of microbubbles adhere to them, and their floating speed is much faster than the sinking speed of the original flocs. The precipitation method has a much shorter separation time. In addition, the air flotation method is not only superior to the sedimentation tank in terms of removing turbidity and color, but also has unique advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/24C02F1/52C02F3/02C02F1/50
CPCY02W10/10
Inventor 李冬张杰王俊安
Owner BEIJING UNIV OF TECH
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